Open AccessResolution‐enhanced sturdy MASH delta–sigma modulator for wideband low‐voltage applications
Author(s) -
Qi Liang,
Sin SaiWeng,
U SengPan,
Martins Rui Paulo
Publication year - 2015
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2015.1655
Subject(s) - delta sigma modulation , wideband , electronic engineering , modulation (music) , sigma , voltage , physics , delta , delta modulation , electrical engineering , materials science , telecommunications , computer science , engineering , acoustics , cmos , quantum mechanics , astronomy , pulse amplitude modulation , pulse (music)
A resolution‐enhanced sturdy multi‐stage noise shaping (MASH) delta–sigma modulator is presented. By employing the Leslie‐Singh architecture in the first stage and an appropriate second stage digital filtering, the proposed structure could achieve much higher resolution [>80 dB signal‐to‐quantisation noise ratio] when compared with a traditional sturdy MASH, at a lower oversampling ratio (e.g. 8X). Interestingly, the mismatch between digital and analogue transfer functions is inherently shaped so that the structure is not sensitive to opamp finite gain error. Both these properties make the proposed structure suitable for wideband low‐voltage applications. Behavioural simulations are presented to demonstrate the effectiveness of the proposed structure when compared with the prior art of its high performance delta–sigma counterparts.